Buick Encore: Cylinder head replacement
Cylinder head replacement - Removal Procedure
Special Tools
- EN-470-B Angular Torque Wrench
- EN-955 Fixing Pin
- EN-953-A Fixing Tool
For equivalent regional tools, refer to Special Tools.
Removal Procedure
- Disconnect battery negative cable. Refer to Battery Negative Cable
Disconnection and Connection .
- Remove the turbocharger. Refer to Turbocharger Replacement.
- Remove the intake manifold. Refer to Intake Manifold Replacement.
- Remove the water outlet. Refer to Water Outlet Replacement (LUJ, LUV) .
- Remove the camshaft position actuator solenoid valve intake and exhaust.
Refer to Camshaft Position
Actuator Solenoid Valve Replacement .
- Adjust the engine to TDC. Refer to Camshaft Timing Chain
Inspection
Fig. 72: Timing Chain Tensioner Plug
- Remove the timing chain tensioner plug (1) from the engine front cover.
Fig. 73: Hexagonal Wrench Rotation Direction
NOTE: Remove and reinstall the EN-953-A fixing tool for this step.
- Install a wrench (1) on the cast hexagonal portion of the intake
camshaft, rotate the camshaft toward the
exhaust camshaft in order to apply tension.
Fig. 74: Timing Chain Tensioner Bore And Pin
- Install EN-955 pin (2) to the timing chain tensioner bore (1) to secure
it in place.
- Remove the wrench from intake camshaft.
Fig. 75: Upper Timing Chain Guide And Bolts
- Remove the upper timing chain guide bolts (1).
- Remove the upper timing chain guide (2).
Fig. 76: Intake Camshaft Sprocket Bolt And Hexagonal Wrench
- Loosen the intake camshaft sprocket bolt (2) while holding up the
hexagon of the intake camshaft with a
wrench (1).
- Loosen the exhaust camshaft sprocket bolt while holding up the hexagon
of the exhaust camshaft with a
wrench.
Fig. 77: Camshaft Position Exciter Wheels And Camshaft Sprocket Bolts
- Remove and DISCARD the camshaft sprocket bolts (2) and the camshaft
position exciter wheels (1).
- Remove the both camshaft position sensors. Refer to Camshaft Position
Sensor Replacement .
Fig. 78: Timing Chain And Camshaft Sprockets
- Remove the camshaft sprockets (2) and timing chain (1) as one unit.
- Allow the camshaft sprockets (2) and timing chain (1) rest on the
front cover. Do NOT remove sprockets
or chain.
- Install the engine support fixture. Refer to Engine Support Fixture.
- Remove the engine mount bracket. Refer Engine Mount Bracket Replacement
- Right Side.
- Remove the drive belt. Refer to Drive Belt Replacement.
- Remove the water pump pulley. Refer to Water Pump Pulley Replacement (LUJ,
LUV) .
Fig. 79: Engine Front Cover Bolts And Water Pump Bolts
- Remove 5 engine front cover bolts (1, 2).
- Remove 3 water pump bolts (3).
- Install engine mount bracket. Refer to Engine Mount Bracket Replacement
- Right Side.
- Install engine mount. Refer to Engine Mount Replacement - Right Side.
- Remove engine support fixture. Refer Engine Support Fixture.
Fig. 80: Cylinder Head Bolts Loosening Sequence
- Loosen the 12 cylinder head bolts in the sequence as shown above. Use
the following procedure:
- First pass: Loosen the cylinder head bolts 90 degrees.
- Final pass: Loosen the cylinder head bolts 180 degrees.
Fig. 81: Cylinder Head, Gasket, Bolts And Guide Sleeves
NOTE: Do not damage the guide sleeves (4, 5).
- Remove and DISCARD the 12 cylinder head bolts (1).
- With the aid of an assistant, lift the timing chain side of the
cylinder head assembly slightly in direction
of the transmission.
- Remove the cylinder head (2).
- Remove the cylinder head gasket (3) and discard the gasket.
Fig. 82: Top Third Of Engine Front Cover Gasket
- With the cylinder head out of vehicle, bend the top third of the engine
front cover gasket (1) back and
forth until snaps off at the breaking point.
- Remove the assembly parts from cylinder head
- Remove the EN-953-A fixing tool
- Remove the intake camshaft. Refer to Intake Camshaft Removal.
- Remove the exhaust camshaft. Refer to Exhaust Camshaft Removal.
- Remove the hydraulic valve lash adjuster arms. Refer to Hydraulic Valve
Lash Adjuster Arm
Removal.
- Remove the hydraulic valve lash adjusters. Refer to Hydraulic Valve Lash
Adjuster Removal.
- Remove the spark plug. Refer to Spark Plug Replacement .
- Remove the engine oil pressure indicator switch.
- Remove the timing chain tensioner. Refer to Timing Chain Tensioner
Removal.
- Remove the 3 engine lift brackets.
- For disassembly of the cylinder head. Refer to Cylinder Head
Disassemble.
- Clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and
Inspection.
- Transfer parts as necessary
Cylinder head replacement - Installation Procedure
- For assembly of the cylinder head. Refer to Cylinder Head Assemble.
CAUTION: Refer to Fastener Caution .
- Install the cylinder head assembly parts:
- Install the 3 engine lift bracket bolts and tighten to 22 (16 lb ft).
- Install the timing chain tensioner. Refer to Timing Chain Tensioner
Installation.
- Install the engine oil pressure indicator switch and tighten to 20 (15
lb ft)
- Install the spark plug. Refer to Spark Plug Replacement .
- Install the hydraulic valve lash adjusters. Refer to Hydraulic Valve
Lash Adjuster Installation.
- Install the hydraulic valve lash adjuster arms. Refer to Hydraulic Valve
Lash Adjuster Arm
Installation.
- Install the exhaust camshaft. Refer to Exhaust Camshaft Installation.
- Install the intake camshaft. Refer to Intake Camshaft Installation.
- Install the EN-953-A fixing tool.
NOTE: Adjust the camshafts by means of the hexagon and a spanner.
- Clean sealing surfaces of engine front cover and engine block from
grease and old gasket material.
Fig. 83: engine front cover gasket
NOTE: The engine front cover gasket comes as a complete unit.
- Before installation the of the new front cover gasket, bend the top
third of the engine front cover gasket
(1) back and forth until snaps off at the breaking point.
Fig. 84: Sealing Compound Application Area
- Apply a 2 mm (0.0787 in) bead of RTV sealant to the areas shown (1).
- Install a NEW cylinder head gasket. The marking "Top" should point to
the cylinder head.
Fig. 85: Engine Front Cover Bolts And Sealing Compound Application Areas
- Install engine front cover bolts (1) in order to guide the NEW upper
engine front cover gasket.
- Apply a 2 mm (0.0787 in) bead of RTV sealant to the areas shown
(2).
Fig. 86: Timing Chain Tensioner, Guide Pin And Cylinder Head
NOTE: A second mechanic is required.
- Guide the timing chain guide pin (2) to the timing chain guide and the
timing chain tensioner (1) with the
installed fixing pin through the timing chain tensioner plug bore in engine
front cover.
Fig. 87: Cylinder Head, Gasket, Bolts And Guide Sleeves
- Install the cylinder head (2).
- Loosely install 12 NEW cylinder head bolts (1).
Fig. 88: Engine Front Cover Bolts
- Adjust the cylinder head to the engine front cover. Use a rubber mallet.
- Position the engine front cover to cylinder head by installing 3 bolts
(1).
CAUTION: Refer to Fastener Caution .
- Tighten the 3 bolts (1) to 8 N.m (71 lb in).
Fig. 89: Cylinder Head Bolts Tightening Sequence
- Tighten the cylinder head bolts in the sequence as shown and in the
following order.
- Tighten the cylinder head bolts to 35 (26 lb ft).
- Tighten the cylinder head bolts an additional 180º. Use EN-470-B wrench.
Fig. 90: Engine Front Cover Bolts
- Loosen the bolts from engine front cover (1).
Fig. 91: Engine Front Cover Bolts And Water Pump Bolts
- Install the remaining bolts to engine front cover and water pump.
- Tighten the engine front cover bolts (1, 2) to 8 N.m (71 lb in).
- Tighten the water pump bolts (3) to 8 N.m (71 lb in).
- Install the engine support fixture. Refer to Engine Support Fixture.
- Remove the engine mount bracket. Refer to Engine Mount Bracket
Replacement - Right Side.
- Install the water pump pulley. Refer to Water Pump Pulley Replacement (LUJ,
LUV) .
- Install the drive belt. Refer to Drive Belt Replacement.
- Install engine mount bracket. Refer to Engine Mount Bracket
Replacement - Right Side.
- Install the engine mount. Refer to Engine Mount Replacement - Right
Side.
- Remove the engine support fixture. Refer to Engine Support Fixture.
Fig. 92: Timing Chain And Camshaft Sprockets
- Install the camshaft sprockets (2) and timing chain (1) as one unit.
Fig. 93: Camshaft Position Exciter Wheels And Camshaft Sprocket Bolts
- Install the camshaft position exciter wheels (1).
- Install the NEW camshaft sprocket bolts (2), hand tight only.
- Install the both camshaft position sensors. Refer to Camshaft Position
Sensor Replacement .
- Remove the EN-955 pin to apply tension to the timing chain.
- Adjust the camshaft timing chain. Refer to Camshaft Timing Chain
Adjustment
Fig. 94: Upper Timing Chain Guide And Bolts
- Install the upper timing chain guide (2).
- Install the upper timing chain guide bolts (1) and tighten to 8 N.m (71
lb in).
Fig. 95: Timing Chain Tensioner Plug
- Install the timing chain tensioner plug and tighten to 50 N.m (37 lb
ft).
- Install the camshaft position actuator solenoid valve intake and
exhaust. Refer to Camshaft Position
Actuator Solenoid Valve Replacement .
- Install the turbocharger. Refer to Turbocharger Replacement.
- Install the Intake manifold. Refer to Intake Manifold Replacement.
- Fill coolant fluid. Refer to Cooling System Draining and Filling .
- Connect battery negative cable. Refer to Battery Negative Cable
Disconnection and Connection .
- Check and correct the engine oil.
- Test the vehicle using the following procedure:
- Crank the engine several times. Listen for any unusual noises or
evidence that parts are binding.
- Start the engine and listen for unusual noises.
- Check the vehicle oil pressure gauge or light and confirm that the
engine has acceptable oil
pressure.
- Run the engine speed at about 1,000 RPM until the engine has reached
normal operating
temperature.
- Listen for sticking lifter and other unusual noises.
- Inspect for fuel, oil and/or coolant leaks while the engine is running.
- Inspect for coolant, oil, gas or exhaust leaks.
READ NEXT:
Special Tools
EN-49980 Guidance Pins
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Remove the right front wheelhouse liner. Refer to Front Wheelhouse Liner
Replacement (
Removal Procedure
Disconnect the battery negative cable. Refer to Battery Negative Cable
Disconnection and
Connection .
Set the engine to TDC. Refer to Camshaft Timing Chain Inspection.
Raise a
Engine replacement - Removal Procedure
Remove the battery and battery tray. Refer to Battery Tray Replacement .
Relieve the fuel system pressure. Refer to Fuel Pressure Relief .
Recover the refrig
SEE MORE:
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Fastener Tightening Specifications
MANUAL TRANSMISSION SPECIFICATIONS
Manual Transmission Specifications
Schematic wiring diagrams
MANUAL TRANSMISSION WIRING SCHEMATICS (ENCORE, MR5)
MR5
Fig. 1: MR5 (Encore, MR5)
MANUAL TRANSMISSION WIRING SC
Brake drum replacement
Special Tools
CH-41013 Rotor Resurfacing Kit
CH-42450-A Wheel Hub Resurfacing Kit
For equivalent regional tools, refer to Special Tools.
Removal Procedure
WARNING: Refer to Brake Dust Warning .
Release the park brake.
Raise and support the vehicle. Refer to Lifting and